ICSE Class 10 Physics 2017 Solved Paper

Question : 14 of 65

Marks: +1, -0

An enemy plane is at a distance of

300 {\km}

from a radar. In how much time the radar will be able to detect the plane? Take velocity of radiowaves at

3 × 10^8 {\ms}^{-1}

Solution:

Given :

d=300 {\km}=300 × 10^3 {\m}, {\V}=3 × 10^8

{\ms}^{-1}

.

We know,

{\V}\;=\;{2 d}/{t}

∴ \ t\;=\;{2 d}/{v}=\;{2 × 300 × 10^3}/{3 × 10^8}

\;=2 × 10^{-3} {\ sec} .

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